ttm_bo_vm.c revision 247835
1/************************************************************************** 2 * 3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 24 * USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27/* 28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 29 */ 30/* 31 * Copyright (c) 2013 The FreeBSD Foundation 32 * All rights reserved. 33 * 34 * Portions of this software were developed by Konstantin Belousov 35 * <kib@FreeBSD.org> under sponsorship from the FreeBSD Foundation. 36 */ 37 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD: head/sys/dev/drm2/ttm/ttm_bo_vm.c 247835 2013-03-05 09:49:34Z kib $"); 40 41#include "opt_vm.h" 42 43#include <dev/drm2/drmP.h> 44#include <dev/drm2/ttm/ttm_module.h> 45#include <dev/drm2/ttm/ttm_bo_driver.h> 46#include <dev/drm2/ttm/ttm_placement.h> 47 48#include <vm/vm.h> 49#include <vm/vm_page.h> 50 51#define TTM_BO_VM_NUM_PREFAULT 16 52 53RB_GENERATE(ttm_bo_device_buffer_objects, ttm_buffer_object, vm_rb, 54 ttm_bo_cmp_rb_tree_items); 55 56int 57ttm_bo_cmp_rb_tree_items(struct ttm_buffer_object *a, 58 struct ttm_buffer_object *b) 59{ 60 61 if (a->vm_node->start < b->vm_node->start) { 62 return (-1); 63 } else if (a->vm_node->start > b->vm_node->start) { 64 return (1); 65 } else { 66 return (0); 67 } 68} 69 70static struct ttm_buffer_object *ttm_bo_vm_lookup_rb(struct ttm_bo_device *bdev, 71 unsigned long page_start, 72 unsigned long num_pages) 73{ 74 unsigned long cur_offset; 75 struct ttm_buffer_object *bo; 76 struct ttm_buffer_object *best_bo = NULL; 77 78 RB_FOREACH(bo, ttm_bo_device_buffer_objects, &bdev->addr_space_rb) { 79 cur_offset = bo->vm_node->start; 80 if (page_start >= cur_offset) { 81 best_bo = bo; 82 if (page_start == cur_offset) 83 break; 84 } 85 } 86 87 if (unlikely(best_bo == NULL)) 88 return NULL; 89 90 if (unlikely((best_bo->vm_node->start + best_bo->num_pages) < 91 (page_start + num_pages))) 92 return NULL; 93 94 return best_bo; 95} 96 97static int 98ttm_bo_vm_fault(vm_object_t vm_obj, vm_ooffset_t offset, 99 int prot, vm_page_t *mres) 100{ 101 102 struct ttm_buffer_object *bo = vm_obj->handle; 103 struct ttm_bo_device *bdev = bo->bdev; 104 struct ttm_tt *ttm = NULL; 105 vm_page_t m, oldm; 106 int ret; 107 int retval = VM_PAGER_OK; 108 struct ttm_mem_type_manager *man = 109 &bdev->man[bo->mem.mem_type]; 110 111 vm_object_pip_add(vm_obj, 1); 112 oldm = *mres; 113 if (oldm != NULL) { 114 vm_page_lock(oldm); 115 vm_page_remove(oldm); 116 vm_page_unlock(oldm); 117 *mres = NULL; 118 } else 119 oldm = NULL; 120retry: 121 VM_OBJECT_UNLOCK(vm_obj); 122 m = NULL; 123 124reserve: 125 mtx_lock(&bo->glob->lru_lock); 126 ret = ttm_bo_reserve_locked(bo, false, false, false, 0); 127 mtx_unlock(&bo->glob->lru_lock); 128 if (unlikely(ret != 0)) { 129 if (ret == -EBUSY) { 130 kern_yield(0); 131 goto reserve; 132 } 133 } 134 135 if (bdev->driver->fault_reserve_notify) { 136 ret = bdev->driver->fault_reserve_notify(bo); 137 switch (ret) { 138 case 0: 139 break; 140 case -EBUSY: 141 case -ERESTART: 142 case -EINTR: 143 kern_yield(0); 144 goto reserve; 145 default: 146 retval = VM_PAGER_ERROR; 147 goto out_unlock; 148 } 149 } 150 151 /* 152 * Wait for buffer data in transit, due to a pipelined 153 * move. 154 */ 155 156 mtx_lock(&bdev->fence_lock); 157 if (test_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags)) { 158 ret = ttm_bo_wait(bo, false, true, false); 159 mtx_unlock(&bdev->fence_lock); 160 if (unlikely(ret != 0)) { 161 retval = VM_PAGER_ERROR; 162 goto out_unlock; 163 } 164 } else 165 mtx_unlock(&bdev->fence_lock); 166 167 ret = ttm_mem_io_lock(man, true); 168 if (unlikely(ret != 0)) { 169 retval = VM_PAGER_ERROR; 170 goto out_unlock; 171 } 172 ret = ttm_mem_io_reserve_vm(bo); 173 if (unlikely(ret != 0)) { 174 retval = VM_PAGER_ERROR; 175 goto out_io_unlock; 176 } 177 178 /* 179 * Strictly, we're not allowed to modify vma->vm_page_prot here, 180 * since the mmap_sem is only held in read mode. However, we 181 * modify only the caching bits of vma->vm_page_prot and 182 * consider those bits protected by 183 * the bo->mutex, as we should be the only writers. 184 * There shouldn't really be any readers of these bits except 185 * within vm_insert_mixed()? fork? 186 * 187 * TODO: Add a list of vmas to the bo, and change the 188 * vma->vm_page_prot when the object changes caching policy, with 189 * the correct locks held. 190 */ 191 if (!bo->mem.bus.is_iomem) { 192 /* Allocate all page at once, most common usage */ 193 ttm = bo->ttm; 194 if (ttm->bdev->driver->ttm_tt_populate(ttm)) { 195 retval = VM_PAGER_ERROR; 196 goto out_io_unlock; 197 } 198 } 199 200 if (bo->mem.bus.is_iomem) { 201 m = vm_phys_fictitious_to_vm_page(bo->mem.bus.base + 202 bo->mem.bus.offset + offset); 203 pmap_page_set_memattr(m, ttm_io_prot(bo->mem.placement)); 204 } else { 205 ttm = bo->ttm; 206 m = ttm->pages[OFF_TO_IDX(offset)]; 207 if (unlikely(!m)) { 208 retval = VM_PAGER_ERROR; 209 goto out_io_unlock; 210 } 211 pmap_page_set_memattr(m, 212 (bo->mem.placement & TTM_PL_FLAG_CACHED) ? 213 VM_MEMATTR_WRITE_BACK : ttm_io_prot(bo->mem.placement)); 214 } 215 216 VM_OBJECT_LOCK(vm_obj); 217 if ((m->flags & VPO_BUSY) != 0) { 218 vm_page_sleep(m, "ttmpbs"); 219 ttm_mem_io_unlock(man); 220 ttm_bo_unreserve(bo); 221 goto retry; 222 } 223 m->valid = VM_PAGE_BITS_ALL; 224 *mres = m; 225 vm_page_lock(m); 226 vm_page_insert(m, vm_obj, OFF_TO_IDX(offset)); 227 vm_page_unlock(m); 228 vm_page_busy(m); 229 230 if (oldm != NULL) { 231 vm_page_lock(oldm); 232 vm_page_free(oldm); 233 vm_page_unlock(oldm); 234 } 235 236out_io_unlock1: 237 ttm_mem_io_unlock(man); 238out_unlock1: 239 ttm_bo_unreserve(bo); 240 vm_object_pip_wakeup(vm_obj); 241 return (retval); 242 243out_io_unlock: 244 VM_OBJECT_LOCK(vm_obj); 245 goto out_io_unlock1; 246 247out_unlock: 248 VM_OBJECT_LOCK(vm_obj); 249 goto out_unlock1; 250} 251 252static int 253ttm_bo_vm_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot, 254 vm_ooffset_t foff, struct ucred *cred, u_short *color) 255{ 256 struct ttm_buffer_object *bo = handle; 257 258 *color = 0; 259 (void)ttm_bo_reference(bo); 260 return (0); 261} 262 263static void 264ttm_bo_vm_dtor(void *handle) 265{ 266 struct ttm_buffer_object *bo = handle; 267 268 ttm_bo_unref(&bo); 269} 270 271static struct cdev_pager_ops ttm_pager_ops = { 272 .cdev_pg_fault = ttm_bo_vm_fault, 273 .cdev_pg_ctor = ttm_bo_vm_ctor, 274 .cdev_pg_dtor = ttm_bo_vm_dtor 275}; 276 277int 278ttm_bo_mmap_single(struct ttm_bo_device *bdev, vm_ooffset_t *offset, vm_size_t size, 279 struct vm_object **obj_res, int nprot) 280{ 281 struct ttm_bo_driver *driver; 282 struct ttm_buffer_object *bo; 283 struct vm_object *vm_obj; 284 int ret; 285 286 rw_wlock(&bdev->vm_lock); 287 bo = ttm_bo_vm_lookup_rb(bdev, OFF_TO_IDX(*offset), OFF_TO_IDX(size)); 288 if (likely(bo != NULL)) 289 refcount_acquire(&bo->kref); 290 rw_wunlock(&bdev->vm_lock); 291 292 if (unlikely(bo == NULL)) { 293 printf("[TTM] Could not find buffer object to map\n"); 294 return (EINVAL); 295 } 296 297 driver = bo->bdev->driver; 298 if (unlikely(!driver->verify_access)) { 299 ret = EPERM; 300 goto out_unref; 301 } 302 ret = -driver->verify_access(bo); 303 if (unlikely(ret != 0)) 304 goto out_unref; 305 306 vm_obj = cdev_pager_allocate(bo, OBJT_MGTDEVICE, &ttm_pager_ops, 307 size, nprot, 0, curthread->td_ucred); 308 if (vm_obj == NULL) { 309 ret = EINVAL; 310 goto out_unref; 311 } 312 /* 313 * Note: We're transferring the bo reference to vm_obj->handle here. 314 */ 315 *offset = 0; 316 *obj_res = vm_obj; 317 return 0; 318out_unref: 319 ttm_bo_unref(&bo); 320 return ret; 321} 322 323#if 0 324int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) 325{ 326 if (vma->vm_pgoff != 0) 327 return -EACCES; 328 329 vma->vm_ops = &ttm_bo_vm_ops; 330 vma->vm_private_data = ttm_bo_reference(bo); 331 vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND; 332 return 0; 333} 334 335ssize_t ttm_bo_io(struct ttm_bo_device *bdev, struct file *filp, 336 const char __user *wbuf, char __user *rbuf, size_t count, 337 loff_t *f_pos, bool write) 338{ 339 struct ttm_buffer_object *bo; 340 struct ttm_bo_driver *driver; 341 struct ttm_bo_kmap_obj map; 342 unsigned long dev_offset = (*f_pos >> PAGE_SHIFT); 343 unsigned long kmap_offset; 344 unsigned long kmap_end; 345 unsigned long kmap_num; 346 size_t io_size; 347 unsigned int page_offset; 348 char *virtual; 349 int ret; 350 bool no_wait = false; 351 bool dummy; 352 353 read_lock(&bdev->vm_lock); 354 bo = ttm_bo_vm_lookup_rb(bdev, dev_offset, 1); 355 if (likely(bo != NULL)) 356 ttm_bo_reference(bo); 357 read_unlock(&bdev->vm_lock); 358 359 if (unlikely(bo == NULL)) 360 return -EFAULT; 361 362 driver = bo->bdev->driver; 363 if (unlikely(!driver->verify_access)) { 364 ret = -EPERM; 365 goto out_unref; 366 } 367 368 ret = driver->verify_access(bo, filp); 369 if (unlikely(ret != 0)) 370 goto out_unref; 371 372 kmap_offset = dev_offset - bo->vm_node->start; 373 if (unlikely(kmap_offset >= bo->num_pages)) { 374 ret = -EFBIG; 375 goto out_unref; 376 } 377 378 page_offset = *f_pos & ~PAGE_MASK; 379 io_size = bo->num_pages - kmap_offset; 380 io_size = (io_size << PAGE_SHIFT) - page_offset; 381 if (count < io_size) 382 io_size = count; 383 384 kmap_end = (*f_pos + count - 1) >> PAGE_SHIFT; 385 kmap_num = kmap_end - kmap_offset + 1; 386 387 ret = ttm_bo_reserve(bo, true, no_wait, false, 0); 388 389 switch (ret) { 390 case 0: 391 break; 392 case -EBUSY: 393 ret = -EAGAIN; 394 goto out_unref; 395 default: 396 goto out_unref; 397 } 398 399 ret = ttm_bo_kmap(bo, kmap_offset, kmap_num, &map); 400 if (unlikely(ret != 0)) { 401 ttm_bo_unreserve(bo); 402 goto out_unref; 403 } 404 405 virtual = ttm_kmap_obj_virtual(&map, &dummy); 406 virtual += page_offset; 407 408 if (write) 409 ret = copy_from_user(virtual, wbuf, io_size); 410 else 411 ret = copy_to_user(rbuf, virtual, io_size); 412 413 ttm_bo_kunmap(&map); 414 ttm_bo_unreserve(bo); 415 ttm_bo_unref(&bo); 416 417 if (unlikely(ret != 0)) 418 return -EFBIG; 419 420 *f_pos += io_size; 421 422 return io_size; 423out_unref: 424 ttm_bo_unref(&bo); 425 return ret; 426} 427 428ssize_t ttm_bo_fbdev_io(struct ttm_buffer_object *bo, const char __user *wbuf, 429 char __user *rbuf, size_t count, loff_t *f_pos, 430 bool write) 431{ 432 struct ttm_bo_kmap_obj map; 433 unsigned long kmap_offset; 434 unsigned long kmap_end; 435 unsigned long kmap_num; 436 size_t io_size; 437 unsigned int page_offset; 438 char *virtual; 439 int ret; 440 bool no_wait = false; 441 bool dummy; 442 443 kmap_offset = (*f_pos >> PAGE_SHIFT); 444 if (unlikely(kmap_offset >= bo->num_pages)) 445 return -EFBIG; 446 447 page_offset = *f_pos & ~PAGE_MASK; 448 io_size = bo->num_pages - kmap_offset; 449 io_size = (io_size << PAGE_SHIFT) - page_offset; 450 if (count < io_size) 451 io_size = count; 452 453 kmap_end = (*f_pos + count - 1) >> PAGE_SHIFT; 454 kmap_num = kmap_end - kmap_offset + 1; 455 456 ret = ttm_bo_reserve(bo, true, no_wait, false, 0); 457 458 switch (ret) { 459 case 0: 460 break; 461 case -EBUSY: 462 return -EAGAIN; 463 default: 464 return ret; 465 } 466 467 ret = ttm_bo_kmap(bo, kmap_offset, kmap_num, &map); 468 if (unlikely(ret != 0)) { 469 ttm_bo_unreserve(bo); 470 return ret; 471 } 472 473 virtual = ttm_kmap_obj_virtual(&map, &dummy); 474 virtual += page_offset; 475 476 if (write) 477 ret = copy_from_user(virtual, wbuf, io_size); 478 else 479 ret = copy_to_user(rbuf, virtual, io_size); 480 481 ttm_bo_kunmap(&map); 482 ttm_bo_unreserve(bo); 483 ttm_bo_unref(&bo); 484 485 if (unlikely(ret != 0)) 486 return ret; 487 488 *f_pos += io_size; 489 490 return io_size; 491} 492#endif 493